Safety valve



Sept. 2, 1930.

v. wlLLouGHBY 1,774,690

SAFETY VALVE Filed Feb. 24, 1928 0. .50 MZ 32 44 4556 53 34 46 Z8 Z6 E IIl] j I l Q.

` vwemtoz Viclofmlauyz/y gf/J v 3 5 the upperedge of thecasing forlimiting the Patented Sept. 2, i930 UNITED. STATES PATENT-"orticavrc'ron WILLOUGHBY, or nrnenwoon, NEW JERSEY, AssreNon. 'ro AxnmcaN can.

' AND' noUNDRY oonrrANY, or NEW Yoan, N. Y., A conroaarIoN or NEWJERSEY.

SAFETY VALVE 'appiicauon med rem-nary 24, 192s. serial Ne. 256,686. i

Reference is had` to the accompan ing drawin which illustrate thepreferred orn of the invention; though it is'to be understood that theinvention is not limited to the exact details of construction shown anddescribed, as it is obvious that various modi cations thereof within thescope ofthe claims will occur to persons skilled in the art.

In the drawings: yThe figure is a' ,vertical sectional'vie'w of;

the valve.

This invention relates to safety valves, and it is one object of -theinvention to provide an improved safety valve for use in tanks orotherlike devices where such valves are de- I sirable.

Another obect of the invention is the-proivision of a sa ety valve ofthe kind 4described Bis employed. The valve B comprises pr1- maril inwhich leakage is prevented bythe utiliza-v tion ofa'suitable gasket.

further object'of the` invention is the provision of a safety-valvehaving a gasketl for preventing leakage, which gasket is replaceablewhile there is pressure in the tank. g1'

`Other ob'ects and6 advantages of this in vention wil be apparent fromthefollowing descriptiontaken with the accompanying a tank, or `any'other suitable container with which a'saf'ety valve indicated generallyat a casing 2 which is threadedlyfengag in the tank or receptacle asshown at 4l and is'provided with .a collar 6 adjacent positioning of thevalve, as will be apparent;

theJ collar being adapted to seat on the outer v surface of the tank A.

tends, the latter extending through a'fr'ustoconical guide 12, which is,in efect,.the' reduced lower end ofthe casing 2. This reduced end orguide 12. defines a'bearing-sur- :face or flange' 14 against which aspring 16 seatSf) The'outer-end of the springt 16 lis supported by afollower 18 carried or suprted by nuts-20 adjustable on the threadedower end 2 2 of the valve stem., Forv obvi- -ous purposes, a` washerv24is interposed bestem but adjacent the upper end thereof, and

said u'pper end ofthe valve stem is reduced and exteriorly threaded asat 30 to .receive nuts 32 which serve to secure a protective cap 34mounted on the valve stem; a suitable' washer-33 being interposedbetween the lower nut 32'and the cap 3 4 for an obviouspurpose. A

vThe cap 34 is more particularly of theform shown, being of inverteddish shape and having abase 36 and a depending annular flange 38 whichoverlaps the upper end of the casin 2. The inner surface of the base isprovide .withgacentral projection or bearing surface 40 having fan*annular bevelled edge 42'and a circumferential rib 44 which is adaptedto restrain al resilient gasket 46 against lateral.

shifting and which serves -to position said gasket.- The 'gasket 46 is"of a diameter 28 so as to overlie the juncture of the valve and. valveseat to ther, the gasket 46,' eing of'resilient mate drawings 1n which Aindicates a portion of' rial, Teadlly conforms t :um "Shape Shown whenthe nuts 32 are screwed home to secure the cap-imposition withthebearing portion eater than the upper surface of the valve" reventleakage. Furso '40 in engagement with the gasket. It will be obviousfrom aninspectio'n ofthe drawings thatwhen the cap is being]l againstthe gasket, the edge' of t e gasket will be forced upwardly due totheengage-` ment of the'rib 44 so that'the upper annular 'gagement with thebevelled'surface 42, and further, it will be apparent that the gasketwill he forced to engagement with the valve secured edge of the gasketwill helarranged in enseat; the arrangement providing in eifecta gaskethavin mg ilange'w ich conforms the valve seat and the bevelled surface42.

y The casing` '2 is provided with transverse nal bore 8 wherebytoestablished commumcation from the interior of the or other an annularpwardly extend- Ikto-th'e shape of 95 bores 48 ladjacent itsl lowerend,and just above the frustoconical guide 12, which bores 'or passagescommunicate'with the longitudireceptacle to the atmosphere when pressurewithin the tank is suicient to raise the valve from its seat.

The upper end of the valve stem 10 is provided with a slot forengagement by a suitable tool whereby to adjust the nuts 20 on thethreaded end 22 to take up or ease the tension of the spring 16 toeffect proper operation of the safety valve. Y

It is believed that the operation of the safety valve just describedwill be fully apparent to those skilled in the art Without furtherelaboration, but attention is called to the fact that the device of thepresent invention is of extreme simplicity, and is strong and durable inconstruction, and in addition, the parts are s connected that byybacking olf the nuts 32 and removing the cap 34 it is possible toreplace the gasket 4G while there is pressure in the tank; the valve 28'serving to efectually seal the interior of the valve casing againstleakage.

What is claimed is:

l. In a safety valve, a hollow7 casing open at its upper end and havingits upper inner edge beveled to provide a valve seat, the lower end ofsaid casing being closed and providedwith an externally arrangedapertured extension having an annular shoulder defining a spring seat,inlet passages formed in the wall of said casing and communicating withthe interior thereof, a valve stem arranged in the casing and extendingthrough the aperture in the extension, a valve intermediate the ends ofsaid stem and normally seating on a portion only of the valve Seat,

a spring seat on thevalve stem, a spring inv terposed between saidspring seats for normally retaining the valve on its seat, an annularshoulder formed on the casing adjacent the upper edgfe thereof, a cap onthe upper end of the valve stem having a depending marginal flange andan internal annular projection, 'a gasket secured to said valve by thecap and engaging the valve seat, the said projection serving to aid thegasket in effecting a s'eal at the juncture of the valve and valve seat,said marginal flange on said cap skirting the upper end of the casingwhen the valve isl in seated position.

2. In a safety valve, ahollow casing open at its upper end and havingits upper inner edge beveled to provide a valve seat, the lower end ofsaid casing being closed and provided .l with an' externally arrangedapertured extension having an annular shoulder ldefining a spring seat,inlet passages formed in the wall of. said'casing and communicating withthe interiorthereof, a valve stem arranged in the casing and extendingthrough tlie a erture inthe extension7 a valve inter-me iate the ends ofsaidstem and normally seating onza ,portion only ofuthe valve seat, aspring seat on the valve stem, a spring interpose between saidl springseats forl normally reseat to effect a seal at the juncture of the valveand valve seat, and a gasket securing element carried by the valve stemand held against I said gasket, said element having an internalprojection embedded in said gasket.

3. In a safety valve, a hollow casing having a valve seat at its upperend and having its lower end closed and provided with an externallyarranged apertured extension having an annular shoulder defining aspring seat, inlet passages formed in the Wall of said casingandcommunicating with the interior thereof, a valve stem through theaperture in saidextension and having its ends arranged outside of thecasing, a valve and a gasket normally co-operating with the valve seatto effect a closure7 said gasket being accessible for replacement whilesaid valve is in its seated position and subjected to fluid pressure, aspring seat adjacent the lower end of the valve stem, and spring meansinterposed between said spring seats for normally retaining the valve onits seat.

In witness whereof I have hereunto set my extending y

